Steam-turbine.



W. G. DODD.

STEAM TURBINE. APPLIGATION FILED PEB.'18, 1913.

086,708. Patented Feb.10,1914.

WITNESSES INVENTOH flaw- 61 COLUMBIA mmoumpu tr. WASHINGTON. p. z

WILLIS G. DODD, OF SAN FRANCISCO, CALIFORNIA.

STEAM-TURBINE.

Specification of Letters Patent.

Patented Feb. 10, 1914.

Application filed February 18, 1913. Serial No. 749,181.

To all whom it may concern:

Be it known that I, WILLIS G. Donn, a citizen of the United States, residing in the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Steam-Turbines, whereof the following is a specification.

My invention relates to impulse turblnes, more particularly to that type or classof turbines, known as compound velocity staged turbines, in which the steam 1s repeatedly redirected upon the rotor by means of reversing chambers, located within a stator. Heretofore in turbines of this class, it has been the practice to construct the casing in such a manner that, the live steam chamber forms an integral part thereof. The objectionable features of this construction are obvious, among which may be mentioned, the excessive radiation of heat, and the uneven expansion of the casing, to which the bearings are attached, which in the event of a crack developing due to this unequal expansion, important and expensive repairs become necessary.

The object of my invention is to construct a turbine in which these objectionable features are overcome, and new features of great utility are obtained.

The live steam chamber in my turbine forms a separate and independent feature, located inside the casing but forms no part thereof. Excessive radiation is prevented, due to the steam chamber being entirely surrounded by a heated medium, viz, the exhaust steam, and should breakage occur from any cause, it can be quickly replaced at small expense. This independent steam ring or chamber as shown, carries the steam nozzles and reversing chambers, and in connection with the rotor constitutes the main operating portion of the turbine, a feature of great importance to the manufacturer, as it enables a large variety of sizes to be carried in stock with reasonable outlay, as the casing with its attendant parts can be quickly supplied when required. Another important and useful feature of this construction will appear in that, two rotors may be employed, one on each side of the steam chamber, thus doubling the power of the turbine, at comparatively small expense.

The means by which I secure the above results, and embody the above features, will be readily understood from the following description, and the accompanying drawings, in which I have illustrated so much of a turbine of the class described as is necessary to the understanding of the invention.

In the drawings; Figure 1 is an elevation in part section of the turbine, and Fig. 2 is a sectional plan view of the same.

Similar letters and figures refer to similar par s.

A is a base plate, B is a steam ring, provided with an annular chamber K. This steam ring B is provided with a series of nozzles C, through which steam is directed upon the rotor G. To the lugs or brackets are secured the stators E within which the reversing chambers are formed. This com bination of steam chamber B, with the nozzles (I, and the stators E, is secured by any suitable means, through the feet L to the base plate. The rotor F, with its shaft G journaled in any suitable bearings, rotates centrally within the stators and steam chamher. The lower and upper halves of the casing, M and M are attached by any suitable means, to the bedplate and inclose the turbine proper, and form a chamber or receptacle for the exhaust or expended steam. The thimble pipe H, with its opening J passes through an opening in the casin (somewhat larger than the outside diameter of the thimble pipe) and is tightly screwed into the steam ring B, thus forming a steam connection from the boiler through the opening J, into the steam chamber K. As the temperature to which the steam ring is sub jected, is greatly in excess of that to which the casing is subjected to, it is obvious that the joint formed by the casing between the thimble pipe H and the steam ring B should be flexible to allow for the difference in expansion which takes place between the casing and the steam ring. Any suitable means may be employed, but as the pressure in the casing rarely if ever exceeds more than one pound above atmosphere, a thin rubber gasket at P, will serve the purpose.

The operation is as follows: The steam being introduced into the thimble pipe J, passes into the chamber K, from thence it is impinged upon the rotor F through the nozzles C, and after being repeatedly redirected upon the rotor in its passage through the reversing chambers it escapes or is exhausted into the casing from whence it is conducted by suitable connections to the atmosphere, or condenser, through the exhaust opening N.

I do not wish to be understood as confining myself to the specific construction here shown, but reserve the right to make such changes and modifications as properly come Within the spirit and scope of my invention, as for example, the reversing chambers are shown as being carried by lugs or brackets, formed integral with the steam ring. I am aware however,that these lugs or brackets may be dispensed with and the reversing chambers attached directly to the steam ring itself. Practice however, has demonstrated that for various reasons the method here shown is a good one.

Having thus described my invention, I claim:

1. In a steam turbine of the class described, the combination of a base plate, a casing for the exhaust steam separably attached thereto, a separate and independent live steam chamber located within said exhaust steam casing and separably attached to said base plate substantially as shown and for the purpose described.

'2. In a steam turbine of the class described, the combination of a base plate, a casing for the exhaust steam attached thereto, a separate and independent live steam chamber located within the exhaust steam casing and attached to said base plate and means for introducing live steam to said chamber, substantially as shown and for the purpose described.

. 3. In a turbine of the class described, the combination of a casing for the exhaust steam, within which is located a separate and independent steam chamber, having reversing chambers attached thereto as and for the purpose described.

4. In a turbine of the class described, the combination of a casing for the exhaust steam, within which is located a separate and independent steam chamber, carrying a series of nozzles and reversing chambers as and for the purpose described.

In testimony that I claim the foregoing I have hereto set my hand this 17 day of Jan. 1913, in the presence of witnesses.

W. Gr. DODD.

Witnesses A. M. SURvnLon, A. B. CRAIG.

copies of this patent may be obtained for five cents each, by addressing the Commissioner qflfatenta, Washington, D. c. 7 

